How To Find Specific Rotation By Half-Shade Polarimeter | Engineering Physics

[@gurtajsingh4298]

The polarimeter seemed difficult when our faculty explained it, but I finally understand it thanks to the great explanation!

[@RohitGuptaPhysics]

Thanku so much.....please subscribe and share 😊

[@premsingh769]

Thanks sir for such nice explanation 🙏 And the way you reply each and every comment in comment box....clears my all doubt regarding this experiment... Thanks a lot sir🙏

[@RohitGuptaPhysics]

Welcome....please subscribe and share 😊

[@nidak9764]

We got the specific rotation -ve. Is that value right for sugar solution with 50kg/m^3

[@RohitGuptaPhysics]

Standard value is +66.5⁰ cm³/g-dm for cane sugar solution. It means that it is capable of rotating the plane polarized light in the clockwise direction. Commercially, dextrose is available and obtainable through the inversion of cane sugar.

[@mahanayakarjuna1108]

best explanation i have ever seen thanks sir..

[@RohitGuptaPhysics]

Welcome.....Please subscribe and share 😊

[@sourikchakraborty1075]

Sir this polarimeter is very useful as the scale and vernier is infront and much bigger for accurate view. But in our laboratory the polarimeter we use that have 2 lenses, one for the yellow light another for the scale which we have to look through lens and set the vernier which is very much painful for eyes😢😢😢.

[@RohitGuptaPhysics]

😔

[@rajdeepmukherjee3012]

Very very helpful! Thank you very much sir!

[@RohitGuptaPhysics]

Welcome.....Please subscribe and share 🙂

[@zorith]

sir , agar hum different coccentration of sugar solutions ke liye readings mote karege jaise app bata rahe the , toh phir specific rotation kaise nikalege kyuki phir mass of sugar and volume different ho jaygega, pls reply sir.

[@RohitGuptaPhysics]

In that case, θ will be changed accordingly then specific rotation can be calculated.

[@zorith]

@@RohitGuptaPhysics sir toh phir Jo different specific rotations milengi unke mean lena hai ya phir result me alag alag state karna hai?

[@RohitGuptaPhysics]

@@zorith Final result is the mean of them.

[@badboyalex9676]

Sir can we use a mercury lamp as light source in manual polarimeter

[@RohitGuptaPhysics]

If you use mercury lamp then you have to use bi-quartz polarimeter.

[@madhuchinthala23]

Thank you sir. very good explanation 👍

[@RohitGuptaPhysics]

Welcome.....please subscribe and share 😊

[@39.vishakhasrivastavabt91]

sir this veideo was really helpful but sir plz explain the things more elaboratly. like i was not very clear about how you have find the the least count

[@RohitGuptaPhysics]

LC=[(Value of small division in MS) ÷ (Total number of divisions in VS)] = 1/10 = 0.1 degree or 6 minutes.

[@adityanarayanbarik503]

Very good explanation

[@RohitGuptaPhysics]

Thanks.....please subscribe and share 😊

[@Saurabh__Mishra08]

Sir how to find error in ploarimeter experiment..? Plz reply🙏

[@RohitGuptaPhysics]

In this case, Standard value is +66.....then % error can be calculated by (Difference/66)× 100.

[@anujkumarpatel3401]

What happen if air bubbles formed in polarimeter tube and light pass through sir bubble??

[@RohitGuptaPhysics]

Because of air bubble, Light will not pass properly through out the solution for the full length of Polarimeter tube.....then readings will be distracted.

[@risabhsharma9929]

Nice Experiment and Explanation.

[@RohitGuptaPhysics]

Thanku.....Please subscribe and share 😊

[@shubhampatel_String_Theorist]

In our lab we took readings when half circle is bright and half circle is dark, not when both are in equal intensities. And we get the really good results. Are both ways correct?

[@RohitGuptaPhysics]

Probably yes

[@anujkumarpatel3401]

Sir why we use distilled water with suger to make solution .

[@RohitGuptaPhysics]

Because sugar is an optically active substance and distilled water has no any other substances to intrupt.

[@mainak0365]

Thank you so much Sir its very helpful Thank You 🙏

[@RohitGuptaPhysics]

Welcome.....please subscribe and share 🙂

[@hridoyghosh5062]

Can we take readings when two halves are equally dark? Please answer me, sir.

[@RohitGuptaPhysics]

No

[@ruchigupta8749]

www.youtube.com/@ruchigupta8749 This is my you tube channel. Maths Gurukul by Ruchi Gupta. Here I am preparing videos class wise ,topic wise, where I am explaining all the concepts one by one with application. The purpose is to help students to practice at their own pace and to help them how to reach the correct solution . Pl, like ,share , subscribe and watch also. If anyone needs help ,cud ping me personally also. Everything is free of cost. Intention to help children in maths and minimize their maths phobia.

[@mohonlaldas2898]

Outstanding ❤

[@RohitGuptaPhysics]

Thanks.....Please subscribe and share 😊

[@ayushprajapatii535]

Thank you sir 🙏

[@RohitGuptaPhysics]

Welcome.....please subscribe and share 😊

[@शिवशिव-ष8ध]

Sir es practical Ka viva questions bhi bta dijiye please sir...

[@RohitGuptaPhysics]

Please watch very end of the video.

[@Gagan_Saggu]

Life saver demonstration, thanks teacher ji.

[@RohitGuptaPhysics]

Welcome.....Please subscribe and share 🙂

[@Gagan_Saggu]

@@RohitGuptaPhysics already done sirji

[@RohitGuptaPhysics]

@@Gagan_Saggu Thanks👍🏻

[@soumikchakraborty9885]

Sir my question is : why we are taking readings only when 2 halfs are equally bright ? Please answer me

[@RohitGuptaPhysics]

The first plate is known as the polarizer. The beam is then rotated as it passes through the sample. After passing through the sample, a second polarizer, known as the analyzer is rotated such that all the light can pass through then one can find the angle of rotation which is equal to the angle by which the analyser was rotated.

[@yachanaprajapati6476]

For this need to study mechanism of half shade device...actually its reason in related by em vibration of light as coming from lamp... when two nicol prism cross each other...dark spot is found.. only electric vibration will play role here..

[@premsingh769]

Thanks sir​@@RohitGuptaPhysics

[@aceraspire5126]

thank u very much sir

[@RohitGuptaPhysics]

Welcome......please subscribe and share 😊

[@yuvrajsingh3876]

Apke tube me bubble na aye us ke liye-tube ko uper tak phar do, do / teen dunde pani gir jaye tube se tab tak phir ek circular glass slit slide karte huye laga do ( uski size ki slit),aur phir tube ko band kardo.😁

[@RohitGuptaPhysics]

जी सही कहा आपने 👍🏻

[@himanshiparte5449]

ye jo bich m sugar solution jisme bhara jata ha bo bich m mota ku hota hai

[@RohitGuptaPhysics]

ताकि अगर कोई air bubble हो तो वो यहा fit हो जाए और light के path को intrupt ना करे।

[@shivanichaurasia2521]

Nice explanation sir thankyou

[@RohitGuptaPhysics]

Welcome.....Please subscribe and share 🙂

[@coco04123]

Sir , why we find 180 degree at first position to be equally brightness ?

[@RohitGuptaPhysics]

To get the maximum brightness in polarimeter device, angles or rotation is made after 180 following a particular rotation either it is clockwise or anticlockwise. Reading at or below 180 does not give clear observation of maximum or minimum brightness. So to get these rotation 180 degree is used.......Hope this will give you some clarification. To get more understanding read about transverse nature of light and how we can prove it based in analyser and polarizer, thereafter apply this in case of polarimeter.

[@continnum_radhe-radhe]

Thank you very much sir 🙏🙏🙏

[@RohitGuptaPhysics]

Welcome.....please subscribe and share 🙂

[@shubhanitripathi4909]

Difference kitne k aana chahiye clockwise or anti clock wise reading m?

[@RohitGuptaPhysics]

?

[@shubhanitripathi4909]

@@RohitGuptaPhysics difference jo aayega clockwise or anti clock wise reading wo 180 degree hoga?

[@RohitGuptaPhysics]

Yes

[@aayushtyagi0093]

really liked awesome video explained everything thank u so much sir

[@RohitGuptaPhysics]

Welcome.....please subscribe and share 😊

[@joshille8707]

Amazing explanation 😀😀

[@RohitGuptaPhysics]

Thanks and best of luck for your new YT channel👍🏻

[@abhisektripathy5023]

How u calculated theta?

[@RohitGuptaPhysics]

Subtract total reading of sugar solution from total reading of water.

[@teamlss8467]

Thanks a lot sir ji!

[@RohitGuptaPhysics]

Welcome.....please subscribe and share 🙂

[@chemistrydrinkbyvinay]

Sir vernier me hi least count se kyu multiply krte hai

[@RohitGuptaPhysics]

Please watch this video to understand least count 👇 kzbin.info/www/bejne/bl65eHmDhdGZaZo

[@NKaur07]

Very helpful thankyou ❤

[@RohitGuptaPhysics]

Welcome.....Please subscribe and share 😊

[@sahibpreetkaur7917]

Sir I have a doubt ki kai baar jaise normal water jab lete hain tab to readings le ki par jab jaise 20% solution banaya usko filter karne ke baad bhi koi ring show Nhi hoti uska kya reason hai?

[@RohitGuptaPhysics]

?

[@sahibpreetkaur7917]

Sir I mean to say I have performed this experiment and there was an error when I took the readings for 20% sugar solution basically no light was visible what could be the reason for that

[@RohitGuptaPhysics]

@@sahibpreetkaur7917 Theoretically light should come after rotating the analyzer for some angle......In your case may be air bubble would have come on the path of light.

[@thunderedsmile05]

Thank you ✨😸

[@RohitGuptaPhysics]

Welcome.....Please subscribe and share 🙂

[@archanabharati4336]

Nice

[@RohitGuptaPhysics]

Thanks.....please subscribe and share 😊

[@afsanam4793]

Thanks sir ☺️

[@RohitGuptaPhysics]

Welcome.....please subscribe and share 😊

[@Yashsingh19-_-]

Sir what standard value should I use ?

[@RohitGuptaPhysics]

For cane sugar solution it is +66.5⁰

[@crazyytshorts4310]

Dono half circle equally bright ho , toh aisi toh 3,4 positions aa rahi h sir , phir konsi wali consider karenge

[@RohitGuptaPhysics]

Consider only 2 positions......Clockwise direction mein analyzer ko move karne par ek position milegi aur fir approx 180 degree ke difference par doosri position milegi.

[@premsingh769]

​@@RohitGuptaPhysicsthanks sir

[@gopalsahu12]

Thanks sir...

[@RohitGuptaPhysics]

Welcome.....Please subscribe and share 😊

[@sachchidakumar8899]

In this exp. How I can decide it is levo or dextro

[@RohitGuptaPhysics]

Compounds which rotate the plane of polarization of a beam of plane polarized light clockwise are said to be dextrorotary, and correspond with positive specific rotation values, while compounds which rotate the plane of polarization of plane polarized light counterclockwise are said to be levorotary.

[@shikhachaudhary8735]

Thnku sir🙏🤍

[@RohitGuptaPhysics]

Welcome.....please subscribe and share 😊

[@RobinPrajapati007]

Sir isme graph bhi bnaga kya?

[@RohitGuptaPhysics]

No

[@RobinPrajapati007]

@@RohitGuptaPhysics sir but jo hme mila h usme graph bhi h Or graph kisi ne bataya hi nahi 🙁

[@RohitGuptaPhysics]

Then it may be for the slope of angular deflection vs concentration i.e. (θ/C)

[@RobinPrajapati007]

@@RohitGuptaPhysics ok thanku sir 👍🤘

[@RohitGuptaPhysics]

@@RobinPrajapati007 Welcome.....please subscribe and share 😊

[@Simon9983]

Thanks you sir

[@RohitGuptaPhysics]

Welcome....please subscribe and share 🙂

[@virtualphysicsexperiment1220]

Sir app jo writing video ka upor deraha othora side or niche dalne se achha hota

[@RohitGuptaPhysics]

?

[@sumanpatel4495]

Sir phle water ka reading lenge or phir sugar ka reading lena hai???

[@RohitGuptaPhysics]

Yes

[@coco04123]

What happened if we use biquartz instead of half shade palarimeter

[@RohitGuptaPhysics]

In that case, we use mercury light instead of sodium light and try to match both half circles of same colour.

[@kumarashvanisahu]

❤❤❤

[@ramansharma5131]

Ye dexro hua ya levo,ye to bata do.

[@RohitGuptaPhysics]

Dextro.......By dextrorotatory, it means that it is capable of rotating the plane polarized light in the clockwise direction......Commercially, dextrose is available and obtainable through the inversion of cane sugar.

[@mohitbhargav2303]

What is the standard value

[@RohitGuptaPhysics]

+66.5⁰ cm³/g-dm

[@mohitbhargav2303]

Sir agr hamari value (-) m aa rhi hoo too

[@mohitbhargav2303]

Orr calculated value m kon si value put kree

[@RohitGuptaPhysics]

@@mohitbhargav2303 obviously jo tumne calculate ki hai

[@MrAbdullah_Ch]

👏💜

[@RohitGuptaPhysics]

Thanks....please subscribe and share 🙂

[@DeepakKumar-ow5sx]

sir please water and sugar dono reading lijiye then calculate

[@RohitGuptaPhysics]

We have already taken both readings.

[@ianujsharmag]

I m confussed with least count

[@ianujsharmag]

Main scale 1 degree how...

[@RohitGuptaPhysics]

@@ianujsharmag In this case the main scale is circular scale with total 360⁰ so value of smallest division in main scale is 1⁰ and total division in vernier scale is 10. Therefore LC = 1/10 = 0.1⁰ or 6 minutes.

[@premsingh769]

​@@RohitGuptaPhysicsthanks sir

[@sachchidakumar8899]

Levo

[@RohitGuptaPhysics]

?

[@GautamKumar-jj5tr]

सामने ये का लिख रहे हैं।

[@RohitGuptaPhysics]

?

[@Ramya0123]

Thank you Sir.

[@RohitGuptaPhysics]

Welcome.....Please subscribe and share 😊

[@krafterpriya]

Thank you so much sir 🙏

[@RohitGuptaPhysics]

Welcome.....please subscribe and share😊

[@parasgupta1391]

Thanks sir

[@RohitGuptaPhysics]

Welcome.....please subscribe and share 😊

[@GautamKumar-jj5tr]

सामने ये का लिख रहे हैं।

[@RohitGuptaPhysics]

?

[@supravatmalas7766]

thank you sir

[@RohitGuptaPhysics]

Welcome.....please subscribe and share 😊